/Engine/Source/Runtime/CoreUObject/Public/UObject/Field.h
https://docs.unrealengine.com/latest/INT/Programming/UnrealArchitecture/StringHandling/FString/
const [FText](API\Runtime\Core\Internationalization\FText) GetMetaDataText ( const [FName](API\Runtime\Core\UObject\FName) & MetaDataKey, const [FString](API\Runtime\Core\Containers\FString) LocalizationNamespace, const [FString](API\Runtime\Core\Containers\FString) LocalizationKey ) const